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#53935
Don
Participant

    US Member

    OK, I "think" I know what you are referring to. Although, in Mumbles’ picture the spring/arm appears to have been wrapped back on the carb throttle arm and tucked under the roller….What is referred to as the over ride spring in Frank’s diagram seems to be in the wrong position or named poorly.
    There should be a spring/arm wrapped around the center carb shaft arm that extends out to the choke shaft and lever. The purpose of this spring is to "over ride" the two stage choke warm up solenoid in the event that the engine was started cold and immediately accelerated hard to WOT in gear. When the throttle is opened wide, the spring/arm in question comes down onto the choke shaft and lever brass arm pushing the choke open, "over riding" the choke "warm up" solenoid. The engine would flood rich/stall due to the partially closed choke if this situation occurred and the spring/arm was not in place/working properly.
    In reality, most of these two stage choke solenoids were rewired to defeat this feature. In other words, both choke solenoid purple leads were wired to the choke switch on the control box leaving the thermal warm up switch doing nothing at all.
    Sorry, I know I could blabber on for days about this, but what you need is a picture. Like I say, the spring I think you are referring to has been bent back out of the way in Mumbles’ picture. Perhaps you can post a picture so I will know if this spring is what you are referring to….D

    PS Rereading your post, you mention this engine is a 1978 70hp, the system I am referring to was not used in 1978. So, I guess I have wasted your time unless your engine is older than 1978.
    The pesky little bugger I am referring to is item 54 on the enclosed diagram:
    http://www.marineengine.com/parts/johns … e+Manifold

    And after researching some more, I see that this spring was indeed used on the 1978 models, even though the two stage choke solenoid was not.